A view of the Russian gas giant Gazprom's recently built Adler thermal power plant in the Russian Black Sea resort of Sochi.

Yuri Kadobnov | AFP | Getty Images

"At the moment due to the worsening political situation in Ukraine it is necessary to note an increase in the risk associated with the transit of gas through the territory of that country. In the spring/summer season, the risk can be assessed as insignificant due to the seasonal decline in natural gas consumption," the state-controlled company said in a quarterly report.